Remove unused interface (#16484)

Author: laurit

instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/config/internal/CommonConfig.java

@@ -8,7 +8,6 @@
 import static java.util.Collections.emptySet;
 
 import io.opentelemetry.api.OpenTelemetry;
-import io.opentelemetry.api.incubator.config.ConfigProvider;
 import io.opentelemetry.api.incubator.config.DeclarativeConfigProperties;
 import io.opentelemetry.instrumentation.api.incubator.log.LoggingContextConstants;
 import io.opentelemetry.instrumentation.api.internal.HttpConstants;
@@ -17,7 +16,6 @@
 import java.util.List;
 import java.util.Set;
 import java.util.logging.Logger;
-import javax.annotation.Nullable;
 
 /**
  * This class is internal and is hence not for public use. Its APIs are unstable and can change at
@@ -42,11 +40,6 @@ public final class CommonConfig {
   private final String loggingSpanIdKey;
   private final String loggingTraceFlagsKey;
 
-  interface ValueProvider<T> {
-    @Nullable
-    T get(ConfigProvider configProvider);
-  }
-
   public CommonConfig(OpenTelemetry openTelemetry) {
     DeclarativeConfigProperties generalConfig =
         DeclarativeConfigUtil.getGeneralInstrumentationConfig(openTelemetry);